Well, since you brought up Revengeance, they announced story DLC for that in April where you play as Sam in one, and LQ-84i in the other.
As for DmC, I don't see more story DLC after Vergil's Downfall. Like the above poster said, maybe some more costumes and a Bloody Palace for him but yeah. They should've just gave him the mode too considering he has Angel and Demon attacks..
Vergils bloody palace would be impossible to make, his story is too short, there is only 2 bosses it would end up being like 50 levels long. dantes was only 100 it just would not work with this game. I would love more dlc but i think its done for